JPH0621628B2 - Lubricating oil bypass circuit - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bypass circuit for quickly draining lubricating oil in an automatic transmission from between a transmission case and a fixing member.

[Prior Art] Conventionally, an automatic transmission having a transmission case in which a transmission mechanism is disposed, and a fixing member disposed in the transmission case and partitioning the transmission mechanism into one transmission mechanism and the other transmission mechanism are provided. In the transmission, a rotating member is arranged adjacent to the fixed member for the purpose of shortening the axial direction of the automatic transmission, and the lubricating oil discharged from the rotating member is transmitted to the surrounding members and drained downward. It was

[Problems to be Solved by the Invention] In the conventional technique described above, the lubricating oil discharged from the rotating member to the surrounding members is connected between the rotating members and between the fixed member and the rotating member. If the speed change mechanism is rotated at a high speed such as when driving at high speeds, the oil will agitate and the lubricating oil will foam and the oil temperature will rise. There was a concern that the oil performance would be adversely affected, such as deterioration of oil performance.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the lubricating oil bypass circuit according to the present invention is provided with a transmission case 2 in which the speed change mechanism 1 is disposed, and a transmission case 2 disposed inside the transmission case 2.
In an automatic transmission having a fixing member 3 that divides the speed change mechanism 1 into one side speed change mechanism 1A and the other side speed change mechanism 1B, the fixing member 3 and the transmission case 2 communicate in the circumferential direction. A circumferential groove 4B, one or more vertical grooves 4A that communicate the circumferential groove with at least one side of the one side transmission mechanism 1A or the other side transmission mechanism 1B, and the circumferential groove 4B are supplied into the circumferential groove 4B. The opening 4D is provided below the vertical groove to drain the lubricating oil.

[Action] The action of the above configuration is that the lubricating oil supplied to the vertical groove 4A among the lubricating oil discharged from the one side transmission mechanism 1A or the other side transmission mechanism 1B to the outer peripheral position of the fixed member 3 is Through the circumferential groove 4B opening to the groove 4A, it flows out from the opening 4D provided at the lower position of the vertical groove 4A such as the lateral side or the lower position.

[Effects of the Invention] In the lubricating oil bypass circuit of the present invention having the above-described configuration, the circumferential groove that communicates in the circumferential direction between the fixed member and the transmission case, the circumferential lid, the one-side transmission mechanism, or the other At least one vertical groove that communicates with at least one side of the side transmission mechanism, and an opening provided below the vertical groove to drain the lubricating oil supplied into the circumferential groove are provided. Thus, the lubricating oil discharged to the outer periphery of the fixed member can be drained through the circumferential groove without flowing out between the rotating members and between the fixed member and the rotating member. It is possible to reduce the resistance, improve the power transmission efficiency, prevent the stirring of the lubricating oil by the rotating member, and eliminate the adverse effects such as the increase of the oil temperature and the bubbling of the oil due to the stirring of the lubricating oil.

[Embodiment] Next, a lubricating oil bypass circuit of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a sectional view showing a lubricating oil bypass circuit of the present invention,
FIG. 2 is a sectional view of an automatic transmission for a vehicle to which the lubricating oil bypass circuit of the present invention is applied.

The automatic transmission 100 includes a hydraulic torque converter 200, a transmission mechanism 1, and a hydraulic control device 400.

The speed change mechanism 1 includes a first planetary gear unit U0, one multi-disc clutch C0 operated by a hydraulic servo, one multi-disc brake B0, and one one-way clutch F0. A planetary gear train U1, a third planetary gear train U2, two multi-disc clutches C1, C2 operated by hydraulic servos, one belt brake B1, two multi-disc brakes B2, B3, and two one-way clutches F1, F2
And the other side speed change mechanism 1B having three forward gears and one reverse gear.

The transmission case 110 of the automatic transmission 100 is a torque converter.
A transmission case that integrally forms a torque converter housing 120 that accommodates 200, a chamber that accommodates a one-sided transmission mechanism 1A that is an overdrive transmission, and a other-sided transmission mechanism 1B that is an underdrive transmission.
2. An extension housing 140 that covers the rear side of the automatic transmission 100. The torque converter housing 120, the transmission case 2, and the extension housing 140 are fastened with a large number of bolts.

The torque converter 200 is housed in a torque converter housing 120 whose front (engine side) is open, and is rotated by a front cover 20 that is driven by an engine (not shown) to rotate.
1, an annular plate-shaped rear cover 202 welded to the inner circumference of the front cover 201, a pump impeller 203 provided around the inner wall of the inner wall surface of the rear cover 202, and a turbine arranged to face the pump impeller 203 Runner 204, the turbine runner 2
Turbine shell 205 holding 04, one-way clutch 2
The stator 208, which is supported by a fixed shaft 207 connected to the transmission case 110 via 06, increases the torque capacity when the input speed is low, the front cover 201 and the turbine shell 20.
A direct coupling clutch (lock-up clutch) 20 that rotates the front cover 201 and the turbine shell 205 at the same time with the 5
Equipped with 9. An internal gear oil pump 15 having an external gear 150a and an internal gear 150b therein is disposed between the torque converter housing 120 and a cylindrical transmission case 2 that is continuous behind the torque converter housing 120.
An oil pump body 152 that houses 0 and has a cylindrical portion 151 that projects forward on the inner periphery is fastened to the front portion of the transmission case 2, and an extension member 210 that is connected to the inner peripheral end portion of the rear cover 202 is cylindrical. The inner periphery of the portion 151 is spline-fitted to the inner periphery of the external gear 150a. Further, on the rear side of the oil pump body 152, an oil pump cover 154 having a cylindrical front support 153 which is coaxial with the cylindrical portion 151 and protrudes rearward is fastened, and the oil pump housing 152 and the oil pump are covered. The cover 154 forms a partition between the torque converter housing 120 and the transmission case 2. Further, in the middle of the transmission case 2, one side transmission mechanism chamber 1C in which one side transmission mechanism 1A is formed and the other side transmission mechanism chamber in which the other side transmission mechanism 1B is formed.
There is provided a fixing member 3 which is an intermediate supporting wall having a cylindrical supporting portion 3A which projects rearward and which partitions 1D.

The fixing member 3 is formed with a circumferential groove 4B that communicates in the circumferential direction on the outer circumference, and a vertical groove 4A that communicates the circumferential groove 4B and the other side transmission mechanism chamber 1D on the other side transmission mechanism 1B side above the outer periphery. The circumferential groove
4B has a vertical groove opening 4C at the side surface position of the vertical groove 4A,
A lower opening 4D is formed at the lower position so that the circumferential groove 4B and the one side transmission mechanism chamber 1C communicate with each other, and the other side transmission mechanism 1B forms a vertical groove 4A.
The lubricating oil released to the inside flows into the circumferential groove 4B from the vertical groove opening portion 4C of the circumferential groove 4B opening to the vertical groove 4A, and flows out from the lower opening portion 4D via the circumferential groove 4B. At the rear portion (right side in the figure) of the transmission case 2, a rear support wall 134 having a cylindrical rear support 133 protruding forward is provided.

Inside the front support 153, the torque converter 2
Fixed shaft of one-way clutch 206 supporting stator 208 of 00
A torque converter 207 is fitted inside the fixed shaft 207.
The input shaft 10 of the speed change mechanism 1, which is the output shaft of 200, is rotatably supported. The input shaft 10 has a flange portion 101 at the rear end.
And a rearward facing hole 102 is formed at the center of the rear end portion. Behind the input shaft 10, an intermediate transmission shaft 11 arranged in series with the input shaft 10 is rotatably mounted, and the tip end of the intermediate transmission shaft 11 slides into a hole 102 of the input shaft 10. A flange portion 111 is provided at the rear end of the intermediate transmission shaft 11, and a rearward facing hole 112 is formed in the center of the intermediate transmission shaft 11 at which the tip end of the output shaft 12 for transmitting power to the drive wheels slides. The output shaft 12 is a sensor rotor 1 for detecting the rotation speed in the extension housing 140.
21, speedometer drive gear 122 is fixed, spline groove 123 is formed on the outer periphery at the outer periphery to fit a sleeve yoke that transmits power to the drive wheel side, and it can be rotated by extension housing 140 via the sleeve yoke. And the front end is rotatably supported in the hole 112 of the intermediate shaft 11.

The one-sided speed change mechanism 1A is provided with a first planetary gear unit U0 behind the input shaft 10, and its ring gear R0 is an intermediate transmission shaft.
The planetary carrier P0 is connected to the flange portion 101 of the input shaft 10, and the sun gear S0 is formed by the inner race shaft 13 of the one-way clutch F0. On the front side of the first planetary gear unit U0, a first hydraulic servo drum 14 opening rearward is fixed to the inner race shaft 13, and an outer peripheral wall 14A of the first hydraulic servo drum 14 is fixed.
The annular piston 15 is fitted between the inner peripheral wall 14B and the inner peripheral wall 14B to form the hydraulic servo C-0 of the clutch C0 that engages and disengages the carrier P0 with the first hydraulic servo drum 14, and the annular piston is provided on the inner race shaft 13 side. 15 for hydraulic servo C-
A clutch C0 is mounted inside the return spring 16 and the outer peripheral wall 14A that are pressed toward the 0 side.
The hydraulic servo drum 14, the inner race shaft 13, and the carrier P0 are connected. A one-way clutch F0 having an inner race shaft 13 as an inner race is provided on the inner circumference of the first hydraulic servo drum 14, and an outer race 17 is provided on the outer circumference thereof.
A clutch C0 and a brake B0 are provided between the transmission case 2 and the transmission case 2, and a fixing member behind the brake B0.
A piston 18 for pressing the brake B0 is fitted in front of 3 to form a hydraulic servo B-0 of the brake B0 between the piston 18 and the fixed member 3, and the piston 18 is attached to the front end inner peripheral portion 135 of the fixed member 3. A return spring 19 for pressing the hydraulic servo B-0 side is fitted.

The other side speed change mechanism 1B has a second opening that opens rearward at the front.
The hydraulic servo drum 20 is rotatably fitted around the outer periphery of the support portion 3A of the fixed member 3, and an annular piston 21 for pressing the clutch C2 is fitted between the outer peripheral wall 20A and the inner peripheral wall 20B of the fixed portion 3. 2 A hydraulic spring C-2 of the clutch C2 is formed between the hydraulic servo drums 20 and a return spring 22 for pressing the annular piston 21 to the hydraulic servo C-2 side on the inner peripheral wall 20B side, and a clutch C2 on the inner side of the outer peripheral wall 20A. Is installed. Behind the second hydraulic servo drum 20,
The third hydraulic servo drum 24, which is open to the rear and has the annular projection 23 on the front side, is the rear flange portion of the intermediate transmission shaft 11.
It is fixed to the outer periphery of 111 and is connected to the rear end of the intermediate transmission shaft 11 and the third
An annular piston 25 for pressing the clutch C1 is fitted between the outer peripheral wall 24A of the hydraulic servo drum 24 and the outer periphery of the flange portion 111, and the hydraulic servo C- of the clutch C1 is inserted between the annular piston 25 and the third hydraulic servo drum 24. The return spring 26 that forms 1 and presses the annular piston 25 toward the hydraulic servo C-1 side on the inner peripheral side of the clutch C1, and the clutch C2 on the outer periphery of the annular protrusion 23 is attached to the second spring through the clutch C2. Three hydraulic servo drums 20 and 24 are connected. Behind the third hydraulic servo drum 24, there is a second planetary gear unit U.
1, a ring gear R1 is provided with an annular projection 28 and a clutch C provided so as to project in front of a rotation support member 27 that rotatably supports the ring gear R1 on the outer circumference of the output shaft 12.
1 is connected to the third hydraulic servo drum 24, and the carrier P1 is spline-fitted to the outer periphery of the front side of the output shaft 12,
The sun gear S1 is integrally formed at the tip of a sun gear shaft 29 rotatably provided on the outer periphery of the output shaft 12. Further, the connecting drum 3 molded so as to cover the second and third hydraulic servo drums 20 and 24 and the second planetary gear unit U1 in the minimum space.
0 is fixed to the outer circumference of the second hydraulic servo drum 20 at its front end, and its rear end is connected to the sun gear shaft 29 behind the second planetary gear unit U1 to fix and release the connection drum 30 on the outer peripheral side. A belt brake B1 for performing the operation is provided.

A brake plate b2 of the brake B2 and a brake plate b3 of the brake B3 are spline-fitted to the front and rear of the spline 136 formed on the inner periphery of the rear portion of the transmission case 2, and the front is provided between the brake B2 and the brake B3. A fourth hydraulic servo drum 32 having an annular protrusion 31 on the front side is spline-fitted. An annular piston 33 for pressing the brake B2 is fitted between the outer peripheral wall 32A of the fourth hydraulic servo drum 32 and the annular protrusion 31, and the brake B is interposed between the annular piston 33 and the fourth hydraulic servo drum 32.
A second hydraulic servo B-2 is formed, and a return spring 34 for pressing the annular piston 33 to the hydraulic servo B-2 side is provided on the inner peripheral wall 32B side. A one-way clutch F1 having a sun gear shaft 29 as an inner race is provided on the inner peripheral side of the brake B2, and the brake B2 is attached to the outer periphery of the outer race 35. A plurality of pistons 371 and 373 for pressing the brake B3 into an annular hole 36 formed between the outer side of the rear support 133 of the rear support wall 134 of the rear side of the brake B2 and the transmission case 2 and the reaction sleeve 37.
2 is fitted to form the hydraulic servo B-3 of the brake B3, and the return spring 38 for pressing the pistons 371 and 373 to the hydraulic servo B-3 side is provided by the return spring fitting 38A attached to the tip of the rear support 133. It is supported. The inner race 39 of the one-way clutch F2 arranged on the inner circumference of the brake B3 is connected to the fourth hydraulic servo drum 32 on the outer circumference of the sun gear shaft 29, and the brake B3 is mounted on the outer circumference of the outer race 40 of the one-way clutch F2. ing. In the third planetary gear unit U2, the sun gear S2 is a sun gear shaft.
29, a carrier P2 is connected to the outer race 40 of the front one-way clutch F2 and a brake B3, and a ring gear R2 having a parking gear 41 around its outer circumference is connected to the inner circumference of the output shaft 12. They are connected through a spline-fitted connecting member 42. The parking gear
Reference numeral 41 is provided so that the parking claw 43 meshes with the parking gear 41 and fixes the output shaft 12 when the shift lever of the automatic transmission is selected to the parking (P) position.

The speed change mechanism 1 includes a bolt 4 at the bottom of the transmission case 2 depending on vehicle driving conditions such as vehicle speed and throttle opening.
Engagement or release of each clutch and brake is performed by the hydraulic pressure that is selectively output from the hydraulic control device 400 in the valve body 403 built in the oil pan 402 that is fastened by 01 to the hydraulic servo of each friction engagement device. , 4 forward gear shifts or 1 reverse gear shift. Table 1 shows an example of the operation of each clutch, the brake, and the one-way clutch and the achieved shift speed (RANGE).

In Table 1, E indicates that the corresponding clutch and brake are engaged, and X indicates that the corresponding clutch and brake are released. L has a corresponding one-way clutch engaged in the engine drive state, but the engagement is not always required because the transmission of power is ensured by a clutch or a brake installed in parallel with the one-way clutch ( Lock).
(L) indicates that the corresponding one-way clutch is engaged only in the engine drive state and is not engaged in the engine brake state. Further, f indicates that the corresponding one-way clutch is free.

FIG. 3 shows another embodiment of the present invention.

In this embodiment, the circumferential groove 4B is formed on the inner circumferential side of the transmission case 2 at the position where the fixing member 3 is fitted therein, and the vertical groove 4A is formed.
Is provided in communication with the one side transmission mechanism chamber 1C on the one side transmission mechanism 1A side and the other side transmission mechanism chamber 1D on the other side transmission mechanism chamber 1B side, and the circumferential groove 4B is provided on the fixing member 3 side. Flute formed 4
There is a vertical groove opening 4C at the outer peripheral position of A, and a lower opening 4D is provided at a position below the circumferential groove 4B by cutting the transmission case 2, and the lower opening 4D is released from the one side transmission mechanism 1A and the other side transmission mechanism 1B. Of the lubricated oil that has been released, the lubricating oil that has been discharged to the vertical groove 4A flows into the circumferential groove 4B from the vertical groove opening 4C, and
It flows out through the lower opening 4D without passing through the rotating members of the one-sided speed change mechanism 1A and the other-side speed change mechanism 1B through 4B.

[Brief description of drawings]

FIG. 1 is a sectional view showing a lubricating oil bypass circuit of the present invention,
FIG. 2 is a sectional view of an automatic transmission for a vehicle to which the lubricating oil bypass circuit of the present invention is applied, and FIG. 3 is a sectional view showing another embodiment of the present invention. In the figure, 1 ... transmission mechanism, 1A ... one side transmission mechanism, 1B ...
Other side transmission mechanism, 1C ... One side transmission mechanism chamber, 1D ... Other side transmission mechanism chamber, 2 ... Transmission case, 3 ...
Fixing member, 4A ... Vertical groove, 4B ... Circumferential groove, 4C ... Vertical groove opening, 4D ... Downward opening, 100 ... Automatic transmission

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuaki Watanabe 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Akira Hoshino, 1 Toyota Town, Aichi Prefecture, Toyota Motor Co., Ltd.

Claims (3)

[Claims] 1. An automatic transmission having a transmission case in which a transmission mechanism is disposed, and a fixing member disposed in the transmission case and partitioning the transmission mechanism into one side transmission mechanism and the other side transmission mechanism. In the above, the circumferential groove that communicates in the circumferential direction and the circumferential groove that communicates with at least one side of the one-side transmission mechanism or the other-side transmission mechanism are provided between the fixing member and the transmission case. A bypass circuit for lubricating oil, comprising: one or more vertical grooves; and an opening provided below the vertical groove to drain the lubricating oil supplied into the circumferential groove. 2. The bypass circuit for lubricating oil according to claim 1, wherein the circumferential groove is formed on the outer periphery of the fixing member. 3. The bypass circuit for lubricating oil according to claim 1, wherein the circumferential groove is formed on an inner circumference of the transmission case.